/**
 * Created by minigci.he on 16/9/9.
 */
console.log('---------------------------')
console.log('test12')

let arr1 = ['c', 'd'];
var value1 = ['a', 'b'].concat(arr1, 'e')
console.log(value1);

let arr2 = ['c', 'd']
arr2[Symbol.isConcatSpreadable] = false;
var value2 = ['a', 'b'].concat(arr2, 'e')
console.log(arr2)